We might even go further and argue that history has become a sub-fieldof biology, focusing on the behaviour of one animal, Homo sapiens.
我们可能需要更加深入地把历史学当作生物学的分支学科来研究,专注研究一种动物的行为表现,那便是智人。
2
As he laboured in each field-consumer behaviour, public finance, international trade, business cycles-he encountered similar problems, which yielded to the same set of mathematical techniques.